Sanitary mouthpiece-cover for telephone-transmitters.



' G. W. BULLEY.

SANITARY MOUTHPIECE COVER FOR TELEPHONE TRANSMITTERS. APPLICATION FILEDsums, i915.

1 ,27 5, 1 24. Patented Aug. 6, 1918.

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UNITED STATES PA ENT oluucn. I i clones wmutnnr, or 03194110, rumors.

seminar noUrnrmcn-covna son TELEPHONE- Tm! To allwk'om it may concern: I

Be it known that I, GEORGE 'W. BUILEY, a citizen of the United States ofAmerica, and resident of Chicago, Cook county, Illinois,'have invented acertain new and useful Improvement in Sanitary Mouth iece-C'ov-i ers forTelephone-Transmitters, 0 which the following is a, specification.

My invention relates to improvements in sanitary mouthpiece covers fortelephone transmitters, and the object of my invention is to provide adevice-of this character which Will be simple, durable and reliable inconstruction and effective and efiicient in operation, and cheap-tomanufacture.

Other objects of my invention will appear" hereinafter.

Referring to the accompanying drawings: Figure 1 is a section through atransmitter mouthpiece and a sanitary cover embodying my invention. iFig. 2 is an enlarged detail section showing the clip and spacerconstruction.

Fig. 3 is a plan viewof the cover disk.- Fig. 4 is a rear face view of aslightly modified m'outhpiececover device, and f' Fig, v5 is an enlargeddetail section on line 55 of Fig. 4. K

The devlce which I have shownin the tecting the transmitter mouthpiecefrom the entrance of dust and germs and at the same time not interferein any sense with theyoperation of the transmitter.

Telephone transmitter .mouthpieces are usually ofa flared or illustratedat A in the drawing. Their forward end is open and thereby they aresubjected' to germs from the person speaking into them, and to dust anddirt because they are exposed. My improved device is intended tofit-over the end of this mouthpiece and thereby effectually close theend against dust and germs. Tl'llS device consists .of a substantiallyflat erably circular in in diameter than mitter mouthpiece. make it ofsuch diameter that its edge is substantially flush with or slightlybeyond the outer rim or edge of the mouthpiece whereshape and slightlylarger the openingv in the trans- Specification of Iietters Iatent.Application filed September a, 1910. Serial in. 119,219.

\ disk, as shown in Flgs. 1 and 2, or they a be small. tongues,

are preferably located beneath drawings-is designed for the purpose ofproin the usual manner.

bell-shape, such as,

" plate and the face thereof disk B of thin metal pref- In fact 1preferably -Patented Aug;

by it substantially covers the area. I also provide several small cligsor holding 'finistributed around bent or formed to of the transmittergers 0, preferably three, the edge of the disk and engage the outersurface mouthpiece.

These clips are spring over the rim the disk isremoved or replaced, andto thus yieldingly grip the mouthpiece and hold the device firmly inplace. I space the disk slightly from the transmitter mouthpiece so asnot to; interfere with the voice currents, and in' the presentconstruction I provide small spacers D which are preferably formedintegrall with the disk. These spacers maybe ormed inxany suitableinstance, they may be in the .form of beads or upsets struck up from thebody of the may Figs. 4 and disk. They or close to the holding clips.They bear against the rim of the mouthpiece. The disk is made sheetmetal thin act as a diaphragm when spoken against, thus setting upvibrations of the air within the mouthpiece which effect the transmitterThe spacing of the disk from the mouthpiece provides an opening whichequalizes the air pressure within as shown in 5, bent back uponthe faceof the the mouthpiece and prevents diflerential pressure on oppositesides of the disk.

One advantage of my improved device is that it can be made entirely inone piece by punching or blanking it from sheet metal and forming it inone operation. The device can be given a neat appearing and sanitaryfinish such as white enamel or nickel can be provided with' a suitableadvertisement.

The combination of a telephone transmitter mouthpiece open at its endand having an annular r m,;a flat thin metallic diaphragm disk ofsubstantially the diameter of the opening positioned. in front thereofand parallel with the plane of the mouthpiece opening, integralspringcl1ps formed at the manner, for

preferably integral with the disk, and formed or bent to snap a of themouthpiece when" enough 'so that it will Y Y edge of the'disk engaginthe mouthpiece Signed R) Y me at Chicago, Illinois, this for holdin thedisk in p ace, and integral 23rd day 0 August, 3 .916;

spacers ho ding the disk slightly separate -GEORGE W. BULLEY. from themouthpiece to leave a thin annular Witnesses: i3 0 ening between themouthplece run and AM! Jun,

t e diaphragm disk. E. H. Cum.

